A spell in the 5th edition of DnD, which allows a bard to damage a creature by insulting them.
Essentially, it's a way to kill creatures using deez-nuts jokes.
DM: The dragon is bloodied and seems like it's on its last points of health. Bard, you're up.
Party: Please, don't use Vicious Mockery...
Bard: He fat.
Dragon: dies.
A comedy website with a front page that seems innocuous in an attempt to distract from the forums which are rampant with unfunny losers who resort to shock and awe as a substitute for any actual humor.
Person 1: "Hey man, did you see on I-Mockery that Boo Berry is at Target all October? That stuff gave me diarrhea".
Person 2: "No, I said something intelligent while posting a picture of a cheeseburger and got banned for life before I could read that memo. Hey wait a sec, isn't Boo Berry that crappy 80's cereal? Vomit."
Person 3: "You're both gay black racist homophobes."